"You have attempted to resubmit too soon" errors happening all the time

I coudlnt find a site wide contact-us so wanted to see if anybody here could help. Basically I have been preparing whole of yesterday and last night I started seeing the "You have attempted to submit too soon" error on about 5 problems and it hasnt recovered since. This was last night (about 10 hours ago) and I am still getting this error when I try to submit. I am not sure what else to do. Any ideas?